Automatic pressure-relief valve for pneumatic tires



L. M. WAMPLER.

AUTOMATIC PRESSURE RELIEF VALVE FOR PNEUMATIC TIRES.

JIFFL-J- THE COLUMBIA PLANnc ml APPLICATION FILED "AR. 3. I9l9.

Patented Sept. 2, 1919.

I j/zggal r I moi/Mega u an" WASHINGTON, I). r.

LUTHER MARION WAMPLER, OF LIBERAL, KANSAS.

AUTOMATIC PRESSURE-RELIEF VALVE FOR PNEUMATIC TIRES.

Application filed March 3, 1919.

To all whom it may concern:

Be it known that I, LUTHER M. WAM- PLER, citizen of the United States,residing at Liberal, in the county of Seward and State of Kansas, haveinvented certain new and useful Improvements in Automatic PressureRelief Valves for Pneumatic Tires; and I do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to valves, and it relates more specifically to animproved automatic pressure-relief valve for pneumatic tires.

One object of this invention is to generally improve upon devices ofthis character by constructing this device of comparatively few andsimple parts, consistent with practicability, efficiency and durability.

A further object is to provide an improved valve which will efiectuallyprevent accidental and continual leakage, whilebeing quite sensitive inyielding'to an over-pressure, so as to permit the escape of air forrelieving such over-pressure.

Other objects and advantages may become apparent to persons who read thefollowing details of description in connection with the accompanyingdrawings, in which Figure 1 is a view of my improved valve partly inelevation and partly in vertical section;

Fig. 2 is a horizontal sectional view along line 2--2 of Fig. 1;

Fig. 3 is a perspective view illustrating my improved complemental valverings or disks.

Referring to these drawings in detail, in which similar referencecharacters correspond with similar parts throughout the several views,the lower end portion 5 and its connection with the inner tube 6, aswell shown in connection with my improved as the rib 7 and felly 8, maybe of any appropriate construction, and are merely valve for the purposeof showing the relation of the valve to such elements.

My improved valve comprises an integral body 9 of tubular shape, thesame having a central bore or opening 10 extending longitudinallytherethrough from end to end- A cap 11 is screw-threaded over the outerend of the body 9, and this body may be fitted air-tight on thescrew-threaded portion 12,

Specification of Letters Patent.

Patented Sept. 2, 1919.

Serial No. 280,219.

although any appropriate form of valve structure (not shown) may beoperable within the outer or upper end portion in any well known mannerfor allowing the entrance of air therethrough into the tube 6, butpreventing the exit of air therethrough. The body 9 also comprises avalve stem 13 and an annular shelf or valve seat 14, the lattersurrounding the base of the valve stem and being provided with any appropriate number of air passages communicatlng with the exterior of thebody through the annular shelf 14 and also communicating with theinterior of the .body 9, that is, they communicate with the opening 10,which extends through the body 9 from end to end. It will be seen thatthe air passages 15 extend downwardly and inwardly from the shelf 14, sothat when a current of air 'is being forced down through the air passage10, there is little, (if any) tendency of the air to pass outwardthrough the air passages 15.

Upon the shelf 14 is secured a fiat resilient rubber ring 16, the samebeing centrally apertured at 17 and eccentrically apertured at 18. Thisring 16 is seated and preferably cemented upon the shelf 14 in suchrelation that the valve stem 13 extends through its central aperturewhile the air passages 15 are in registry with its apertures 18,respectively. It will be seen, therefore, that no air can pass from theair passages 15 exce t through the apertures 18.

A flat resi ient rubber ring or disk 19 is movably seated upon the ring16, and this ring 19 is provided with a central aperture 20 and witheccentrically positioned studs or bosses 21 which are of a size andshape to fit tightly in the aperture 18 and render the latter air-tight.A flat metal ring 22 is seated on the rubber ring 19 and constittutes aspring seat against which a helical spring 23 presses with suflicientforce to counteract the normal outward pressure of air in the tire andvalve. However, in the event that the air in the tire or tube 6 expandsbecause of excessive heat or any other cause, and such expansion causesthe air pressure to exceed a predetermined normal,

the valve member or rubber ring 19 upon the rubber ring 16.

In order that the predetermined normal pressure may be varied, I providescrew threads 24 at the outer end portion of the valve stem, and engagean adjusting nut 25 therewith, and I may employ a washer 26 between thespring 23 and nut 25. It is obvious that by screwing the nut 25downward, the downward pressure of the spring 13 on the valve member 19is increased, so that a greater pressure of air will be required toraise this valve member.

In order that the device may be protected from dust, mud, rain, etc, Iprovide a hood 27 which is secured by screw-threads to the enlargedlower portion of the body 9, and this hood is provided with an openingor air outlet 28 which is normally covered by means of a flat spring 29.Therefore, when air escapes through the apertures 18 into the hood, itmay escape from the hood through the opening 28 by its pressure slightlyraising the spring 29.

Although I have described this embodiment of my invention veryspecifically, it is to be understood that this invention is not limitedto these exact details of construction and arrangements of parts, andthat I am entitled to make changes within the scope of the inventiveidea disclosed in the foregoing description and following claim.

'What I claim as my invention is:

In a device of the character described, a tubular bodycomprising avalve-stem and an annular valve-seat around one end of the valve stem,said valve-stem being normally closed but adapted to be opened to permitair to be forced through said body, said body being provided withair-passages communicating with its interior and with its exteriorthrough said valve-seat; an apertured rubber ring around said valve-stemand seated on said valve-seat in air-tight relation to the latter exceptthat its apertures register with the said airepassages; a rubber ringformed with bosses and being normally seated on the first said rubberring and having its bosses fitted in the apertures of the first saidrubber ring; and yieldable means to normally press the second said ringupon the first said ring so that the apertures of the first said rubberring are closed by the bosses of the second said rubber ring and areadapted to be opened by excessive pressure of air in said air-passages.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

LUTHER MARION WAMPLER.

Witnesses J. E. FITZGERALD, Jon T; DU RAIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D; G.

